AV25-2 User Manual. 1 Important safety instructions
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1 AV25-2 User Manual 1 Important safety instructions 1. Please read carefully prior to product installation or operation. 2. Read these instructions. 3. Keep these instructions. 4. Heed all warnings. 5. Follow all instructions. 6. Do not use this apparatus near water. 7. Clean only with dry cloth. 8. Do not block any ventilation openings. Install in accordance with manufacturer s instructions. 9. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. 10. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade and/or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 11. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point they exit from the apparatus. 12. Only use attachments/accessories specified by the manufacturer. 13. Use only with the cart, stand, tripod, bracket, or table provided by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over. 14. Unplug this apparatus during lightning storms or when unused for long periods of time. 15. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate properly, or has been dropped. AV25-2 User Manual Rev A Page 1
2 2 Approvals This equipment has been tested and found to be compliant with the limits for Class A Digital device pursuant to part 15 of the FCC rules. This equipment has successfully passed UL Standard Fire Test for Heat and Visible Smoke Release for Discrete Products Installed in Air-Handling Spaces. 3 Warnings 3.1 Explanation of Warning Symbols Lightning Bolt The lightning bolt within arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of un-insulated dangerous voltage within the product s enclosure that may be of sufficient magnitude to constitute a risk of electrical shock to person Exclamation Point The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instruction in the literature accompanying the appliance. 3.2 Warnings WARNING: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT EXPOSE THIS AMPLIFIER TO RAIN OR MOISTURE. DANGEROUS HIGH VOLTAGES ARE PRESENT INSIDE THE ENCLOSURE. DO NOT OPEN THE CABINET. REFER SERVICING TO QUALIFIED PERSONNEL ONLY. Use only the power supply shipped with the device. 3.3 User Responsibility Mains Connection Grounding Your amplifier must be connected to a grounded outlet. Do not defeat the safety purpose of the polarized or grounding-type plug Speaker Output Hazard Power amplifiers are capable of producing hazardous output voltages. To avoid electrical shock, do not touch any exposed speaker wiring while the amplifier is operating. External wiring connected to the speaker terminals shall be installed by a qualified person. Do not connect or disconnect speaker AV25-2 User Manual Rev A Page 2
3 wires while the mains power is on. Do not connect speaker wires together or to ground as this may result in permanent damage to your amplifier Radio Interference This product has been tested and complies with the EMC directive, and with FCC part 15 Class A. If this product is not used in accordance with these operating instructions, it may cause interference with to other equipment, such as radio and television receivers Speaker Damage Loudspeakers may be damaged or destroyed if overpowered. Always check the loudspeaker s continuous and peak power ratings to prevent such an occurrence. Do not rely solely on the amplifier s volume control to reduce output power to a level safe for the loudspeakers Maintenance Clean regularly with a soft cloth to remove dust and debris. Also check that there is adequate ventilation for convection cooling. AV25-2 User Manual Rev A Page 3
4 4 1 Important safety instructions Approvals Warnings Explanation of Warning Symbols Lightning Bolt Exclamation Point Warnings User Responsibility Mains Connection Grounding Speaker Output Hazard Radio Interference Speaker Damage Maintenance Welcome Features Unpacking and Visual Inspection Installation and Setup Pole Mounting Universal Mount Installation Cooling and Ventilation Operating Voltage Rear Panel Operation Input Connections Speaker Connections Specifications Troubleshooting Warranty Information Warranty Summary Eligibility Requirements Non-warranty Repairs Return Procedure Shipment Instructions Packaging Instructions AV25-2 User Manual Rev A Page 4
5 5 Welcome Congratulations on the purchase of your new Stewart Audio AV25-2 audio amplifier. This amplifier has been designed and built to provide you with years of high-quality audio performance and troublefree operation. If after reading this operation manual you have questions concerning amplifier installation and operation, please contact your Authorized Stewart dealer, or you may contact us directly using the contact information provided on the back of this guide. 5.1 Features The AV25-2 audio amplifier offers 2 channels of clean, full-range, dynamic audio with 25W output power per channel in a sub-compact ¼ rack enclosure. It has been optimized for 4Ω and 8Ω loudspeakers. The Signal Detect circuitry automatically places the amplifier in sleep mode and wakens it when a signal is present. The contact-closure terminals mute the audio output for fire alarm applications. There are multiple mounting options to fit a variety of applications. The external in-line power supply provides plenty of power to achieve full, rated audio output power. This product is proudly manufactured in the USA. 5.2 Unpacking and Visual Inspection Every Stewart Audio product is carefully tested and inspected before leaving the factory and should arrive in perfect condition. If any damage is discovered, please notify the shipping carrier immediately. Save the packing materials for the carrier s inspection and for any future shipping. 5.3 Installation and Setup Pole Mounting The AV25-2 amplifier is Stewart Audio s first line of pole-mountable amplifiers. The AV25-2 has mounting holes on both the top as well as the side of the unit, which can be used with the AV-Pole bracket available from Stewart Audio. Part Number: AV-Pole AV25-2 User Manual Rev A Page 5
6 5.3.2 Universal Mount Installation The AV25-2 also has a universal mount bracket available which allows the unit to be mounted against a wall or under a table. Two screws are included in the kit, which will affix the bracket to the top or side of the unit. Two holes in the bracket are available for mounting the unit where desired Cooling and Ventilation The AV25-2 is a convection-cooled amplifier. Ensure that there is sufficient open space around the amplifier to allow for free air flow. Do not stack amplifiers on top of each other or mount amplifier in a way that air flow around the unit will be impaired. Inadequate airflow around the amplifier may cause the amplifier to overheat and potentially become damaged as a result Part Number: AV-Bracket Operating Voltage The AV25-2 is shipped with an in-line power supply. This is a universal power supply that operates on AC mains from V at 50 or 60 Hz. The 48VDC output from this supply is connected to the rear of the amplifier. Use only the power supply shipped with the amplifier. AV25-2 User Manual Rev A Page 6
7 6 Rear Panel Speaker Output Connectors 3.5mm Eurostyle connections to low impedance speakers (4/8Ω). 2. Contact Closure Mute connectors 3.5mm Eurostyle mute connector. Short terminals to mute; open to unmute VDC Power Conector Connect 48VDC output from in-line power supply shipped with unit. There is no on/off switch; the amplifier is on whenever the power is applied. Stewart Audio recommends connecting the power to the amplifier before the in-line power supply is plugged into the AC receptacle. 4. Power Indicator This blue LED illuminates when DC power is applied. Note that this will dim when the amplifier is in sleep mode (approximately 5 minutes with no input signal on either channel). 5. Clip Indicators These red LEDs illuminate when an excessive input signal levels are applied. Reduce signal level to avoid distortion. 6. Signal Present Indicator The green LED illuminates to indicate an input signal is present on either channel. 7. Input Connectors Connect audio sources via these 3.5mm Eurostyle connectors. 8. Channel 1 Level Control Turn fully clockwise for maximum output on output 1. Note that the input sensitivity of the AV25-2 is 0.5V rms. Do not overdrive the amplifier. 9. Channel 2 Level Control Turn fully clockwise for maximum output on output 2. In normal operation, the DC voltage on the speaker output connectors is approximately 24VDC. Do not connect any speaker output to ground or to the amplifier chassis. Do not connect speakers across speaker outputs. (Bridge mode is not supported.) 6.1 Operation Input Connections Your AV25-2 amplifier is provided with a 3-pin Phoenix connector for each input. This connector will accept balanced or unbalanced connections, however some modifications must be made for an unbalanced connection. See the next two sections for instructions on connecting your amplifier to its input source. AV25-2 User Manual Rev A Page 7
8 Balanced Connections When using a balanced input source and connector, you must ensure that the hot, cold, and ground pins of the connector are matched up to the +, -, and ground pins of the AV25-2 s Phoenix connector respectively. Diagrams have been provided for standard XLR and TRS connectors. Please refer to the manual of your input source in case it does not follow the standard pin-out Unbalanced Connections When using an unbalanced input source and connector, a jumper must be added between the negative (-) terminals and the ground terminals. Then the unbalanced source can be connected to the positive (+) and ground terminals. Diagrams have been provided for standard RCA and TS connectors. Please refer to the manual of your input source in case it does not follow the standard pin-out Speaker Connections Stewart Audio recommends using high-quality, heavy-gauge speaker wire and connectors to send the output signal of your amplifier to the speakers. Use the following table as a guideline when selecting your wire gauge. Distance Up to 25 ft. Wire Gauge 16 AWG ft. 14 AWG ft. 12 AWG Speaker leads connect by means of removable terminal block connectors supplied with the unit. Strip speaker leads 1/4 and insert into connector observing proper polarity. With a small, flat-blade AV25-2 User Manual Rev A Page 8
9 screwdriver, tighten the screw until the leads are held securely in place. Inspect for possible shorts or broken wires. In normal operation, the DC voltage on the speaker output connectors is approximately 24VDC. Do not connect any speaker output to ground or to the amplifier chassis. Do not connect speakers across speaker outputs. (Bridge mode is not supported.) NOTE: Class 2 wiring must be used on the speaker terminals to comply with UL requirements. CAUTION: Do not connect either speaker terminal to ground. This will cause a short circuit which may damage the amplifier, speaker, or both. Similarly, do not connect any speaker terminal to ground. AV25-2 User Manual Rev A Page 9
10 7 Specifications Max. Output Power (all channels driven) 4 Ω Stereo Power 35W/channel 8 Ω Stereo Power 25W/channel Performance Frequency Response (+0, -3dB, 1W) 30 Hz 20 khz Power Bandwidth 30 Hz 30 khz Signal to Noise Ratio >95 db THD+Noise full power Signal to Noise Ratio >100 db External Mute Contact Closure Slew Rate 30V/microsecond Input Sensitivity 0.5V (-6 dbv) Standard Voltage Gain 28X (26.5 db) Input Impedance (Balanced/Unbalanced) 20kΩ/10kΩ Standby, Idle Current Draw; 1/8 Power Draw 5mA, 10mA, 7.2W Characteristics Amplifier Class D Input Connectors 3.5mm Euroblock Output Connectors 3.5mm Euroblock Power Supply External in-line 48VDC (included) Cooling Convection (no fan) Controls Level, Mute LED Indicators Power, Signal Present, Clip (2) Construction Aluminum Enclosure Dimensions (Length, Width, Height) X 4.35 X 1.25 (81mm X 110mm X 32mm) Weight < 0.37 lbs. ( 0.16kg)) Warranty years Plenum Rating UL2043 Compliant 8 Troubleshooting Power indicator (LED) is not illuminated. Check that the amplifier is plugged into a live outlet. Apply an input audio signal to one or both inputs to wake the amplifier from sleep mode. After you have ensured that it is not a power issue and that the amplifier is not in sleep mode, disconnect any speakers. If the amplifier turns on after a few seconds delay, then the problem is in the output connection. Check wiring and speakers for short circuits. Make certain that the speaker leads are not grounded. No output on one or both channels; Power indicator is lit. Check that level controls are not turned down. Check that input and output connections are secure. Ensure signal present LED is illuminated to denote a signal. If there is no signal detected check signal source and that level controls are set high enough. AV25-2 User Manual Rev A Page 10
11 Amplifier overheats and/or shuts off. Review section5.3.3 on proper cooling procedures. Check the signal lights on the rear of the amplifier to see if the signal is overdriving (the clip light flashes red frequently). Overdriving the amplifier for extended periods of time can result in a thermal shutdown. Output sound is distorted or cracking. Check all cables for damage or loose connections and reduce the gain on the input signal at the mixer or preamp level. Replace the cables and loudspeakers temporarily to see if this resolves the problem. If problem still exists, contact your Authorized Dealer for service. 9 Warranty Information 9.1 Warranty Summary All Stewart Audio amplifiers and accessories, unless excluded in this summary, are covered by a 3- year limited warranty on parts and labor from the data of purchase. In order to be eligible for warranty repairs, the amplifiers and accessories must have been purchased through an authorized Stewart Audio dealer and submitted by the original purchaser. This warranty is only valid in the country in which the amplifier was purchased. 9.2 Eligibility Requirements Stewart Audio warrants against all malfunctions which come as a result of component or manufacturer defect. The amplifier is also covered from all failures which arise during the warranty period (3 years from date of purchase) that are not a result of misuse. The following actions will void your warranty: The power cord or AC plug has been damaged through misuse. The amplifier has been exposed to moisture or extreme temperatures. The amplifier has been dropped, items have been dropped on the amplifier, or the enclosure has been damaged. The amplifier has been opened by the operator. The amplifier was improperly packaged when sending to the factory for repair, resulting in damage. Any of the precautions or instructions found in this manual were not followed. Damages resulting to the amplifier which are not covered under this warranty can be factory-repaired at cost to the customer. Use the contact information below to initiate the repair process. 9.3 Non-warranty Repairs An estimate for all non-warranty repairs will be provided to the customer once the unit has been AV25-2 User Manual Rev A Page 11
12 shipped to the factory. The customer is responsible to approve this estimate within 7 days. If the repairs are not approved within 14 days, Stewart Audio reserves the right to consider the unit scrap and may discard it. Payment for non-warranty repairs must be submitted to Stewart Audio before the product will be returned to the customer. 10 Return Procedure All returns to the factory for service must be accompanied by a Return Authorization (RA) number. One can be obtained by contacting Stewart Audio at (209) or via at support@stewartaudio.com. NOTE: Any defective products received without an RA number will be returned to sender at their expense. If Stewart Audio is unable to contact the sender in 14 days, the merchandise will be considered scrap and may be disposed of Shipment Instructions If Stewart Audio requests that you ship the defective product back to their service center, please refer to the guide below. To ensure prompt warranty service, be sure to follow all instructions. Return Authorization (RA) is required for product being sent to the factory for service. See packing instructions in Section Ship the defective product using a method which provides for order tracking or order confirmation. The service center is located at the following address: Stewart Audio Cuesta Court Suite C Sonora, CA Use a bold black marker and write the RA number on three sides of the box. Record the RMA number for future reference. The RA number can be used to check the repair status Packaging Instructions Should Stewart Audio request that you ship your product to their service center, these instructions must be followed in order to ensure safe delivery. If they are not followed, Stewart Audio assumes no responsibility for damaged goods and/or accessories that are sent with your unit. 1. Please write the RA number on three sides of the box. Include the Stewart Audio RA number inside the box and a brief description of the problem. 2. You will be advised during the RA process what accessories should be included with the amplifier (power supplies, connectors, cords, etc.). This is dependent on the failure AV25-2 User Manual Rev A Page 12
13 assessment. 3. When shipping your amplifier, it is important that it has adequate protection. We recommend you use the original packing material when returning the product for repair. If you do not have the original box, see number If you provide your own shipping pack, use materials adequate to prevent damage during transit. Make certain that the amplifier is NOT free to move within the package, as this is the most common cause of damage. 5. Securely seal the package with an adequate carton sealing tape. 6. Do not use light boxes or peanuts. NOTE: Damage caused by poor packaging will not be covered under warranty. AV25-2 User Manual Rev A Page 13
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